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Key Differences
| Color | White | Off White |
| Elongation @ Break | 5 % | 10 % |
Disclaimer
Although we do our best to ensure the accuracy of this Compare Tool, Smooth-On offers no warranty either expressed or implied as to the reliability of the information contained herein. Smooth-On assumes no liability for loss or damage associated with use of the Compare Tool. If this is a critical project, we encourage you to review all of the technical data below and contact our Technical Service department with any questions or concerns.All Technical Data
| Smooth-Cast® 300 | Smooth-Cast® 320 | |
|---|---|---|
| Product Type |
|
|
| Mixed Viscosity | 80 cps | 80 cps |
| Mix Ratio By Volume | 1A:1B | 1A:1B |
| Mix Ratio By Weight | 100A:90B | 100A:90B |
| Pot Life | 3 minutes | 3 minutes |
| Cure Time | 10 minutes | 10 minutes |
| Shore D Hardness | 70 | 70 |
| Specific Gravity | 1.05 g/cc | 1.05 g/cc |
| Specific Volume | 26.4 cu. in./lb. | 26.4 cu. in./lb. |
| Color | White | Off White |
| Tensile Strength | 3,000 psi | 3,000 psi |
| Tensile Modulus | 139,500 psi | 138,000 psi |
| Elongation @ Break | 5 % | 10 % |
| Compressive Strength | 4,000 psi | 3,650 psi |
| Compressive Modulus | 45,800 psi | 45,800 psi |
| Flexural Strength | 4,510 psi | 4,500 psi |
| Flexural Modulus | 128,000 psi | 132,000 psi |
| Shrinkage | 0.01 in. / in. | 0.01 in. / in. |
| Heat Deflection Temp | 120 °F | 140 °F |
Product Description
Smooth-Cast® 300
The Smooth-Cast® 300 Series of liquid plastics are ultra-low viscosity casting resins that yield castings that are bright white and virtually bubble free. Vacuum degassing is not necessary. They offer the convenience of a 1A:1B by volume or 100A:90B by weight mix ratio. The differences between them are pot life and demold time.
These resins readily accept fillers (such as URE-FIL® 3 ) and can be colored with SO-Strong® or Ignite® color tints (Smooth-Cast® 325 series accepts pigments better than the Smooth Cast® 300 series). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast® 300 Series Liquid Plastics include reproducing small to medium size sculptures, making prototype models, special effect props and decorative jewelry.
Those interested in making roto cast pieces should refer to the Smooth-Cast® 65D technical bulletin.
Smooth-Cast® 320
The Smooth-Cast® 320 Series consists of ultra-low viscosity casting resins that yield virtually bubble-free off-white castings. The Smooth-Cast® 320 resins are sister products to our popular Smooth-Cast® 300 Series of bright white plastics, but are easier to color using SO-Strong® or Ignite® color tints. Smooth-Cast® 320 series is easy to mix and pour, offering the convenience of a 1A:1B by volume or 100A : 90B by weight mix ratio.
The Smooth-Cast® 320 Series resins readily accept pigments and fillers (such as URE-FIL® 3, 5 and 7 from Smooth-On). Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast® 320 Series resins include reproducing small to medium size sculptures, making prototype models, special effect props, decorative jewelry and taxidermy (bones, antlers, teeth etc.).